Just to put this into perspective. I do not believe that the Polestar optimisation on my 2012 XC70 D5 has the overboost feature and to be honest I don't know that it really needs more that the basic enhancement that the Polestar rewrite gives. The acceleration is markedly better and I'm not sure what I'd do with more than what it now has!
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2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey
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